"George Miles" wrote in message
...
I was thinking if i ever get a Air Source heat pump
then maybe have the inlet pipe in the cellar?

Because in the winter the cellar is warmer than the house,
- it gets heat from the earth.

Is this a good idea or daft?

Daft. The conductivity of the earth is poor.

You can get around that with non air sourced heat pumps
because the ground coils are sized to work properly but
that isnt possible with a cellar.